Tomoko Suzuki serves as the matriarch of the prestigious Suzuki family, wife to Shiro Suzuki, and mother to Ayako and Sonoko Suzuki. The Suzuki family ranks among Tokyo's wealthiest, surpassed only by the Karasumas. Tomoko consistently employs formal speech, using "watakushi" for herself and "anata" when addressing others. Protecting the Suzuki reputation is her paramount concern. This initially led her to disapprove of her daughter Sonoko's relationship with Makoto Kyogoku, fearing Sonoko might embarrass the family name. She later revised her opinion, recognizing Kyogoku's serious nature and formidable fighting skills, qualities she deemed suitable for teasing. With her elder daughter Ayako married into the Tomizawa family, Tomoko holds the responsibility of ensuring Sonoko's future partner is capable of managing the Suzuki family's extensive affairs. Tomoko appears during the New Year's party at the Suzuki residence featured in "Detective Conan: Episode One – The Great Detective Turned Small." Guest Takanori Sewa receives threatening letters, prompting Shinichi Kudo to offer security assistance, an offer Sewa declines citing increased guards. The celebration turns into a crime scene when a bank president is murdered, leading Inspector Megure to investigate. This incident occurs shortly before Shinichi's fateful encounter with the Black Organization at Tropical Land, which results in his transformation into Conan Edogawa.